So found a Brooklyn jury on all nine charges leveled against Adis Medunjanin, the 28-year-old would-be subway bomber who was convicted in federal court Tuesday afternoon, thanks to the excellent work of the feds and the NYPD.

Medunjanin grew up in Queens but flew off to Pakistan with two pals from Flushing HS in 2008 to join the Taliban and try to kill American troops.

They didn’t make it into battle, but were recruited by al Qaeda and sent to a terrorist training camp, where they were groomed by high-level operatives. Their mission: Return to the US as suicide bombers.

The treacherous trio settled its sights on the teeming subway platforms beneath Grand Central; they were days away from striking before the plot was disrupted in September 2009. Prosecutors called it “one of the most serious terrorist plots against the homeland since 9/11.”

New Yorkers need no reminder that the city remains the world’s top terror target — but this case spotlights the danger of home-grown radicals who possess US passports and can be nearly impossible to track.

The defense argued that Medunjanin had a “romantic vision” of jihad, merely wanted to fight for his beliefs in Afghanistan and pulled out of the plot back home. Not quite.

When the NYPD and FBI came to search his house, he drove off on the Whitestone Expressway, called 911 and shouted an al Qaeda slogan: “We love death more than you love life.”

He then “attempted to commit a terrorist attack by crashing his car,” say the feds.

A wannabe killer to the end.

Medunjanin faces life in prison at his sentencing on Sept. 7. Here’s hoping they throw away the key.